author | hgs |
Wed, 13 Oct 2010 19:39:18 +0530 | |
changeset 71 | 28ccaba883f4 |
parent 0 | e4d67989cc36 |
permissions | -rw-r--r-- |
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/** @file ../include/dirent.h |
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@internalComponent |
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*/ |
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|
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/** @fn getdirentries(int x, char *ptr, int y, long *lptr) |
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getdirentries(int fd, char *buf, int nbytes, long *basep) |
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@param x |
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@param ptr |
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@param y |
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@param lptr |
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@return If successful, the number of bytes actually transferred is returned. |
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Otherwise, -1 is returned and the global variable errno is set to indicate the error. |
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|
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The getdirentries system call reads directory entries from the directory |
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referenced by the file descriptor x into the buffer pointed to by ptr, in a file system independent format. Up to y of data will be transferred. The y argument must be greater than or equal to the block size associated |
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with the file, see stat. Some file systems may not support these system |
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calls with buffers smaller than this size. |
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|
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The data in the buffer is a series of dirent |
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@code |
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structures each containing the following entries: u_int32_t d_fileno; |
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u_int16_t d_reclen; |
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u_int8_t d_type; |
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u_int8_t d_namlen; |
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char d_name[MAXNAMELEN + 1];/* see below */ |
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@endcode |
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|
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The d_fileno entry is a number which is unique for each distinct file in |
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the file system. Files that are linked by hard links (see link ) have the same d_fileno. The d_reclen entry is the length, in bytes, of the directory record. The d_type entry is the type of the file pointed to by the directory record. |
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The file type values are defined in \<sys/dirent.h\>. Presently, however, file type is not supported |
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and d_type is set to 0. The d_name entry contains a null terminated file name. The d_namlen entry specifies the length of the file name excluding the null |
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byte. Thus the actual size of d_name may vary from 1 to MAXNAMELEN + 1. |
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|
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Entries may be separated by extra space. |
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The d_reclen entry may be used as an offset from the start of a dirent structure to the next structure, if any. |
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|
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The actual number of bytes transferred is returned. The current position pointer |
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associated with x is set to point to the next block of entries. The pointer may not |
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advance by the number of bytes returned by getdirentries . A value of zero is returned when the end of the directory |
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has been reached. |
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|
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The getdirentries system call writes the position of the block read into |
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the location pointed to by lptr. Alternatively, the current position pointer may be set and retrieved |
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by lseek. The current position pointer should only |
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be set to a value returned by lseek, a value returned in the location pointed |
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to by basep ( (getdirentries); only) or zero. |
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|
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Examples: |
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@code |
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/* reading directory stream using getdirenttries */ |
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/* considering directory c: emp already exists */ |
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#include <stdio.h> |
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int main() |
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{ |
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int retval; |
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long basep=(off_t) 0; |
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char buf[1024]; |
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struct dirent * d; |
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char * dname="C:\ emp\ |
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char * fname="C:\ emp\input.txt"; |
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int fd,fd1; |
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fd1=open(fname,O_WRONLY|O_CREAT); |
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if(fd==-1) |
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{ |
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printf("file creation failed"); |
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return -1; |
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} |
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fd=open(dname,O_RDONLY); |
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if(fd==-1) |
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{ |
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printf("directory opening failed"); |
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return -1; |
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} |
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retval = getdirentries (fd, buf,(unsigned int)sizeof (buf),&basep); |
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if(retval == -1) |
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{ |
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printf("getdirentries call failed"); |
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return -1; |
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} |
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|
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d=(struct dirent *)buf; |
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|
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printf("name of the file in the newly created directory is \"%s\",d-d_name); |
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|
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close(fd1); |
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close(fd); |
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return 0; |
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} |
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@endcode |
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Output |
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@code |
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name of the file in the newly created directory is "input.txt" |
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@endcode |
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@see lseek() |
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@see open() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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105 |
|
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/** @fn opendir(const char *_path) |
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@param _path |
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|
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Note: This description also covers the following functions - |
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readdir() readdir_r() telldir() seekdir() rewinddir() closedir() dirfd() |
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|
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@return closedir function returns 0 on success or -1 on failure. |
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|
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The opendir function |
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opens the directory named by _path , |
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associates a directory stream with it |
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and |
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returns a pointer to be used to identify the directory stream in subsequent operations. |
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The pointer NULL is returned if filename cannot be accessed, or if it cannot malloc enough memory to hold the whole thing. |
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|
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The readdir function |
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returns a pointer to the next directory entry. |
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It returns NULL upon reaching the end of the directory or detecting an invalid seekdir operation. |
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|
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The readdir_r function |
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provides the same functionality as readdir , |
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but the caller must provide a directory entry buffer to store the results in. |
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If the read succeeds, result is pointed at the entry ; |
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upon reaching the end of the directory result is set to NULL . |
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The readdir_r function |
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returns 0 on success or an error number to indicate failure. |
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|
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The telldir function |
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returns the current location associated with the named directory stream . |
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Values returned by telldir are good only for the lifetime of the DIR pointer, dirp , |
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from which they are derived. |
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If the directory is closed and then |
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reopened, prior values returned by telldir will no longer be valid. |
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139 |
|
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The seekdir function |
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sets the position of the next readdir operation on the directory stream . |
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The new position reverts to the one associated with the directory stream when the telldir operation was performed. |
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143 |
|
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The rewinddir function |
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resets the position of the named directory stream to the beginning of the directory. |
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146 |
|
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The closedir function |
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closes the named directory stream and frees the structure associated with the dirp pointer, |
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returning 0 on success. |
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On failure, -1 is returned and the global variable errno is set to indicate the error. |
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151 |
|
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The dirfd function |
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returns the integer file descriptor associated with the named directory stream , |
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see open . |
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|
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@code |
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Sample code which searches a directory for entry ‘‘name’’ is: len = strlen(name); |
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dirp = opendir("."); |
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while ((dp = readdir(dirp)) != NULL) |
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if (dp->d_namlen == len && !strcmp(dp->d_name, name)) { |
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(void)closedir(dirp); |
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return FOUND; |
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} |
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(void)closedir(dirp); |
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return NOT_FOUND; |
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@endcode |
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|
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Examples: |
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@code |
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/* Detailed description: This test code demonstrates usage of opendir system call, open directory name test. |
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Preconditions: Expects Test directory to be present in the current working directory. |
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*/ |
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#include <sys/types.h> |
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#include <dirent.h> |
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int main() |
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{ |
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DIR *DirHandle; |
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if(!(DirHandle = opendir("Test") ) ) |
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{ |
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printf("Failed to open directory Test\n"); |
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return -1; |
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} |
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printf("Directory Test opened \n"); |
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return 0; |
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} |
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@endcode |
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@code |
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Output |
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Directory Test opened |
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@endcode |
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|
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Limitations: |
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|
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The filename parameter of the opendir() function should not exceed 256 characters in length. |
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|
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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|
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|
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|
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|
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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|
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/** @fn readdir(DIR *dp) |
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@param dp |
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Refer to opendir() for the documentation |
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn rewinddir(DIR *dp) |
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@param dp |
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Refer to opendir() for the documentation |
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn alphasort(const void *d1, const void *d2) |
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@param d1 |
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@param d2 |
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Refer to scandir() for the documentation |
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@see directory() |
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@see malloc() |
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@see qsort() |
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@see dir() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn scandir(const char *dirname, struct dirent ***namelist, int(*)(struct dirent *), int(*)(const void *, const void *)) |
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@param dirname |
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@param namelist |
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Note: This description also covers the following functions - |
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alphasort() |
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The scandir function |
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reads the directory dirname and builds an array of pointers to directory |
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entries using malloc It returns the number of entries in the array. |
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A pointer to the array of directory entries is stored in the location |
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referenced by namelist. |
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The select argument is a pointer to a user supplied subroutine which is called by scandir to select which entries are to be included in the array. |
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The select routine is passed a |
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pointer to a directory entry and should return a non-zero |
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value if the directory entry is to be included in the array. |
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If select is null, then all the directory entries will be included. |
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The compar argument is a pointer to a user supplied subroutine which is passed to qsort to sort the completed array. |
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If this pointer is null, the array is not sorted. |
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The alphasort function |
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is a routine which can be used for the compar argument to sort the array alphabetically. |
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The memory allocated for the array can be deallocated with free , |
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by freeing each pointer in the array and then the array itself. |
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Examples: |
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@code |
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//Illustrates how to use scandir API. |
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#include <dirent.h> |
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Void scandirTest() |
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{ |
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struct dirent **namelist; |
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int n; |
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// Function call to get the dir entries into the namelist. |
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n = scandir("\home\manjus\GETTEXT", &namelist;, 0, 0); |
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if(n > 0) // if scandir is successful it retuns the number of entries greater than 0 |
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{ |
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// print all the entries in the directory. |
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while(n--) |
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{ |
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printf("dir name @ pos %d is %s",n,namelist[n]->d_name); |
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} |
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} |
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} |
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@endcode |
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Diagnostics: |
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Returns -1 if the directory cannot be opened for reading or if malloc cannot allocate enough memory to hold all the data structures. |
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Limitations: |
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The dirname parameter in scandir() should not exceed 256 characters in length. |
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@see directory() |
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@see malloc() |
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@see qsort() |
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@see dir() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn seekdir(DIR *dp, long index) |
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@param dp |
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@param index |
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Refer to opendir() for the documentation |
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @fn telldir(DIR *dp) |
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@param dp |
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Refer to opendir() for the documentation |
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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@publishedAll |
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*/ |
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/** @fn closedir(DIR *dp) |
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@param dp |
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Refer to opendir() for the documentation |
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@see close() |
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@see lseek() |
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@see open() |
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@see read() |
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@publishedAll |
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@externallyDefinedApi |
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*/ |
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/** @typedef typedef struct _dirdesc DIR |
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defines DIR data type through typedef. A type representing a directory stream. |
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@publishedAll |
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*/ |
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/** @def dirfd(dirp) |
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get directory stream file descriptor |
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@publishedAll |
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@released |
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*/ |
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/** @def DTF_HIDEW |
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@released |
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*/ |
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/** @def DTF_NODUP |
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@publishedAll |
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@released |
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*/ |
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@publishedAll |
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@released |
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*/ |
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/** @def __DTF_READALL |
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flags for opendir2. everything has been read. |
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@publishedAll |
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@released |
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*/ |
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